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  3. Nearly a week passed before the girl was able to explain what______to her.

Nearly a week passed before the girl was able to explain what______to her.

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问题 Nearly a week passed before the girl was able to explain what______to her.
选项 A、had happened
B、happened
C、happen
D、would happen
答案A
解析 主句是过去时，what引导的宾语从句中谓语动词happen所表示的动作发生在pass这一动作之前，即发生在“过去的过去”，所以应用过去完成时。故选A。
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